EP1387483A2 - Motor control apparatus - Google Patents
Motor control apparatus Download PDFInfo
- Publication number
- EP1387483A2 EP1387483A2 EP03254732A EP03254732A EP1387483A2 EP 1387483 A2 EP1387483 A2 EP 1387483A2 EP 03254732 A EP03254732 A EP 03254732A EP 03254732 A EP03254732 A EP 03254732A EP 1387483 A2 EP1387483 A2 EP 1387483A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- motor
- control apparatus
- circuit
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/28—Arrangements for controlling current
Definitions
- the present invention relates to a motor control apparatus and,more particularly, to a motor control apparatus that detects the current of a motor and feeds back the detected motor current, thereby subjecting the motor to current feedback control.
- the driving current of a motor is detected, and the motor is feedback-controlled so that the detected motor current value is equal to a command current value.
- an inverter unit to PWM control to carry out current control, for example, driving currents for individual phases of the motor are detected, and PWM signals are originated so that the detected motor current values are equal to command current values for the individual phases. Based on the originated PWM signals, the inverter unit is regulated to control the motor currents for the individual phases.
- a resistor is inserted in series in an electric conductor or output wire of the inverter unit through which the motor currents flow, and a potential difference across the resistor is detected, whereby the motor driving currents are detected.
- Described in Japanese Patent Application Laid-Open No. 7-15972 is a method in which detected motor currents'are ⁇ -modulated so that they can be fed back accurately.
- a resistor for current detection is inserted in a circuit through which a current to drive the motor flows, in order to detect the actual current of the motor, it generates heat. If a high motor driving current is run, in particular, heat release from the resistor is substantial, so that the capacity of the resistor must be increased. Further, this heat release worsens the environment of installation of the motor and the motor control apparatus, e.g., the inverters unit, and exerts a bad influence upon peripheral apparatuses. If an attempt is made to feed back accurate driving currents by ⁇ modulation by means of a ⁇ modulator circuit, therefore, the effect of the ⁇ ⁇ modulation is reduced by half.
- An embodiment of the present invention can provide a small-sized, economical motor control apparatus that generates little heat.
- a motor control apparatus comprises: a voltage output circuit for detecting a magnetic flux from the current of a motor by means of a Hall element and outputting voltage proportional to the actual current of the motor in accordance with the detected magnetic flux; and a ⁇ modulator circuit for detecting the voltage delivered from the voltage output circuit.
- the motor is subjected to feedback control based on the voltage detected by the ⁇ modulator circuit.
- Another motor control apparatus comprises a circuit for detecting a magnetic flux from the current of a motor by means of a Hall element and outputting a current proportional to, and smaller than, the actual current of the motor.
- the value of voltage produced across a resistor located in series at the output of the circuit is detected by means of a ⁇ modulator circuit.
- the motor is subjected to feedback control based on the voltage detected by the ⁇ modulator circuit.
- the output of the ⁇ modulator circuit may be a one-bit digital signal to be processed by means of a digital filter.
- the output value of the ⁇ modulator circuit may be used for overcurrent detection.
- the temperature of a Hall element mounting region may be detected by means of temperature detecting means mounted near the Hall element, and the offset voltage of the Hall element subjected to temperature drift compensation based on the temperature information.
- the output of the temperature detecting means may be modulated by means of a ⁇ modulator circuit.
- FIG. 1 shows an example of a motor control apparatus for drivingly controlling an inverter unit with PWM signals.
- a host circuit such as a position and speed control circuit, or in accordance with command currents for individual phases and the actual current of a motor detected and fed back, a current control circuit 3 carries out current feedback control and delivers a voltage command to a PWM signal generator circuit 2.
- phase current commands of two phases are applied to the current control circuit 3, and real-phase currents of these two phases are detected and fed back to the current control circuit 3.
- a phase current command and a real-phase current of the remaining phase are obtained in the current control circuit 3 in accordance with the phase current commands and real-phase currents of those two phases.
- the current control circuit 3 delivers voltage commands of the three phases to the PWM signal generator circuit 2.
- the PWM signal generator circuit 2 Based on the voltage commands of the individual phases, the PWM signal generator circuit 2 generates a PWM signal for turning on or off a switching element of an inverter unit 1, thereby drivingly controlling the inverter unit 1.
- the motor is drivingly controlled by the output of the inverter unit 1.
- the motor control apparatus of the present embodiment is constructed in the same manner as a conventional motor control apparatus that is based on PWM control. It is characterized in the technique for detecting the driving current of the motor.
- reference numeral 4 denotes an electric conductor of one phase through which motor current delivered from the inverter unit 1 flows.
- a magnetic body 14 is located around the electric conductor 4.
- a magnetic flux that is generated by current that flows through the electric conductor 4 passes through the magnetic body 14.
- a magnetic flux path is formed in the magnetic body 14.
- the magnetic body 14 is in the form of a tube that has a ring-shaped cross section. A part of the ring of the cross section is removed to form a gap. A Hall element 11 is located in this gap.
- An amplifier 12 is connected to the Hall element 11. The output of the amplifier 12 is connected to one end of a coil 13 that is wound around the magnetic body 14 so as to surround the magnetic flux path. The other end of the coil 13 is grounded through a resistor 15.
- the Hall element 11, amplifier 12, coil 13, magnetic body 14, and resistor 15 constitute a voltage output circuit 10 that detects the actual current of the motor, converts it into voltage, and outputs the voltage.
- the value of voltage that is produced across the resistor 15 is applied to the input of a first ⁇ modulator circuit 21.
- the output of the first ⁇ modulator circuit 21 is applied to the respective inputs of first and second digital filters 22 and 23.
- the output of the first digital filter 22 is applied to the input of an adder 27.
- the output of the second digital filter 23 is applied to the input of the current control circuit 3, and it is fed back to a machine that is provided with the motor and the like or a host control apparatus, such as a numerical control apparatus.
- a temperature sensor 16 is located near the Hall element 11.
- the sensor 16 is attached to that part of the magnetic body 14 which is situated near the Hall element 11.
- the output of the temperature sensor 16 is applied to a second ⁇ modulator circuit 25 through an amplifier 24.
- the output of the second ⁇ modulator circuit 25 is applied to the input of the adder 27 through a digital filter 26. Further, the output of the adder 27 is fed back to the current control circuit 3.
- FIG. 1 arrow A represents the direction of the magnetic flux that is generated as the current flows through the electric conductor 4.
- This magnetic flux is detected by means of the Hall element 11 in the gap that is formed by' partially removing the tubular magnetic body 14.
- the detection output of the Hall element 11 is amplified by the amplifier 12, and current is supplied to the coil 13 so as to cancel the magnetic flux. More specifically, the coil 13 is supplied with current such that a magnetic flux that has a direction (arrow B) opposite to the direction (arrow A) of the magnetic flux that is produced by the current that flows through the electric conductor 4 is formed in the magnetic body 14.
- an infinitesimal current proportional to the motor current that flows through the electric conductor 4 flows through the resistor 15 that is connected to the coil 13.
- a voltage difference across the resistor 15 that is generated by the infinitesimal current is applied to the input of the first ⁇ modulator circuit 21 and ⁇ -modulated by the circuit 21.
- a one-bit digital signal that represents the motor current value is outputted.
- the outputted digital signal is cleared of quantizing noise and the like by means of the first and second digital filters 22 and 23.
- a one-bit digital signal output of the second digital filter 23 is fed back to the current control circuit 3 and the host control apparatus and utilized for overcurrent detection.
- the motor current that is represented by the digital signal from the second digital filter 23 is concluded to be an overcurrent by an overcurrent detector circuit in the current control circuit 3, the output (voltage command) of the circuit 3 is stopped.
- the host control apparatus gives an alarm or the like if the overcurrent is identified by the level of the motor current that is represented by the signal from the second digital filter 23.
- the output of the first digital filter 22 is applied to the input of the adder 27. Further, the output of the temperature sensor 16 is amplified by the amplifier 24, ⁇ -modulated and converted into a one-bit digital signal by the ⁇ modulator circuit 25, and applied to the input of the adder 27 through the third digital filter 26.
- the adder 27 adds the output (i.e., signal indicative of temperature near the Hall element 11 detected by the temperature sensor 16) of the third digital filter 26 to the output (i.e., signal indicative of the motor current value based on the magnetic flux detected by the Hall element 11) of the first digital filter 22, thereby subjecting the offset voltage of the Hall element 11 to temperature drift compensation. After undergoing the temperature drift compensation, the ⁇ -modulated one-bit digital signal that is indicative of the detected motor current value is fed back to the current control circuit 3.
- the current control circuit 3 carries out current feedback control in accordance with a feedback signal indicative of the detected motor current value and the current commands from the host circuit or the position and speed control circuit, and delivers the voltage commands to the PWM signal generator circuit 2. Based on these voltage commands, the PWM signal generator circuit 2 generates and outputs the PWM signal for turning on or off the switching element of the inverter unit 1, thereby drivingly controlling the inverter unit 1. Thus, the driving current is supplied to each phase of the motor to drive the motor.
- the magnetic flux that is produced by the motor current is detected by means of the Hall element 11.
- the current that is caused to flow through the coil 13 and the resistor 15 by the detected magnetic flux is an infinitesimal current that is proportional to and lower than the motor current. Therefore, the resistor 15 may be a small-capacity one that generates little heat.
- the value of the voltage across the resistor 15 is modulated and converted into a one-bit digital signal by the ⁇ modulator circuit 21, cleared of quantizing noise and the like by means of the digital filters, and fed back as an actual current detection feedback signal to the current control circuit 3. Accordingly, an accurate feedback signal that represents the actual current can be obtained, so that the motor control apparatus can be a small-sized, economical one.
- the digital signal that is modulated by means of the ⁇ ⁇ modulator circuit 21 is an unweighted one-bit digital signal. If the signal is subject to noise or the like in the feedback path, therefore, it cannot be a substantially wrong signal. Thus, an accurate current detection signal that resists noise can be fed back.
- a small-sized, economical motor control apparatus that generates little heat, owing to the small value of current flowing through the resistor 15, which current is proportional to the actual current of the motor flowing through the electric conductor 4,
- the value of the current flowing through the resistor 15 is small compared with the motor current, and is preferably infinitesimal which, in the context of the present embodiment, is preferably a value below 1 ampere
- an infinitesimal current may be given as a value of electric current calculated by dividing the motor current by the number of turns of coil 13 of Fig. 1.
- the number of turns of a coil which is widely used is about 2000, although the number of turns may be selected dependent upon a motor current to be detected.
- the voltage output circuit 10 of Fig. 1 is preferably designed so that the infinitesimal current flowing through the resistor 15 will be 0.2 ampere.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Electric Motors In General (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
A magnetic flux (A) produced by the current (4)
of a motor is detected by means of a Hall element (11),
and an infinitesimal current proportional to the actual
current (4) of the motor is outputted. The outputted
infinitesimal current is run through a resistor (15),
and a potential difference across the resistor (15) is
detected by a ΔΣ modulator circuit (21). The motor is
subjected to feedback control based on the potential
difference detected by the ΔΣ modulator circuit (21).
Description
The present invention relates to a motor control
apparatus and,more particularly, to a motor control
apparatus that detects the current of a motor and feeds
back the detected motor current, thereby subjecting the
motor to current feedback control.
In a generally known motor control method, the
driving current of a motor is detected, and the motor
is feedback-controlled so that the detected motor
current value is equal to a command current value. In
subjecting an inverter unit to PWM control to carry out
current control, for example, driving currents for
individual phases of the motor are detected, and PWM
signals are originated so that the detected motor
current values are equal to command current values for
the individual phases. Based on the originated PWM
signals, the inverter unit is regulated to control the
motor currents for the individual phases.
In this motor control apparatus, a resistor is
inserted in series in an electric conductor or output
wire of the inverter unit through which the motor
currents flow, and a potential difference across the
resistor is detected, whereby the motor driving
currents are detected. Described in Japanese Patent
Application Laid-Open No. 7-15972 is a method in which
detected motor currents'are ΔΣ-modulated so that they
can be fed back accurately.
If a resistor for current detection is inserted
in a circuit through which a current to drive the motor
flows, in order to detect the actual current of the
motor, it generates heat. If a high motor driving
current is run, in particular, heat release from the
resistor is substantial, so that the capacity of the
resistor must be increased. Further, this heat release
worsens the environment of installation of the motor
and the motor control apparatus, e.g., the inverters
unit, and exerts a bad influence upon peripheral
apparatuses. If an attempt is made to feed back
accurate driving currents by ΔΣ modulation by means of
a ΔΣ modulator circuit, therefore, the effect of the Δ
Σ modulation is reduced by half.
An embodiment of the present invention can provide
a small-sized, economical motor control apparatus that
generates little heat.
A motor control apparatus according to the
present invention comprises: a voltage output circuit
for detecting a magnetic flux from the current of a
motor by means of a Hall element and outputting voltage
proportional to the actual current of the motor in
accordance with the detected magnetic flux; and a ΔΣ
modulator circuit for detecting the voltage delivered
from the voltage output circuit. The motor is subjected
to feedback control based on the voltage detected by
the ΔΣ modulator circuit. Another motor control
apparatus according to the invention comprises a
circuit for detecting a magnetic flux from the current
of a motor by means of a Hall element and outputting a
current proportional to, and smaller than, the actual
current of the motor. The value of voltage produced
across a resistor located in series at the output of
the circuit is detected by means of a ΔΣ modulator
circuit. The motor is subjected to feedback control
based on the voltage detected by the ΔΣ modulator
circuit.
The output of the ΔΣ modulator circuit may be a one-bit
digital signal to be processed by means of a
digital filter. The output value of the ΔΣ modulator
circuit may be used for overcurrent detection. Further, the
temperature of a Hall element mounting region may be
detected by means of temperature detecting means
mounted near the Hall element, and the offset voltage
of the Hall element subjected to temperature drift
compensation based on the temperature information.
Furthermore, the output of the temperature detecting
means may be modulated by means of a ΔΣ modulator
circuit.
FIG. 1 shows an example of a motor control
apparatus for drivingly controlling an inverter unit
with PWM signals. Instructed by a host circuit, such as
a position and speed control circuit, or in accordance
with command currents for individual phases and the
actual current of a motor detected and fed back, a
current control circuit 3 carries out current feedback
control and delivers a voltage command to a PWM signal
generator circuit 2. Normally, in subjecting a three-phase
motor to three-phase current feedback control,
phase current commands of two phases are applied to the
current control circuit 3, and real-phase currents of
these two phases are detected and fed back to the
current control circuit 3. A phase current command and
a real-phase current of the remaining phase are
obtained in the current control circuit 3 in accordance
with the phase current commands and real-phase currents
of those two phases. Thus, the current control circuit
3 delivers voltage commands of the three phases to the
PWM signal generator circuit 2.
Based on the voltage commands of the individual
phases, the PWM signal generator circuit 2 generates a
PWM signal for turning on or off a switching element of
an inverter unit 1, thereby drivingly controlling the
inverter unit 1. The motor is drivingly controlled by
the output of the inverter unit 1.
For these particulars, the motor control
apparatus of the present embodiment is constructed in
the same manner as a conventional motor control
apparatus that is based on PWM control. It is
characterized in the technique for detecting the
driving current of the motor.
In FIG. 1, reference numeral 4 denotes an
electric conductor of one phase through which motor
current delivered from the inverter unit 1 flows. A
magnetic body 14 is located around the electric
conductor 4. A magnetic flux that is generated by
current that flows through the electric conductor 4
passes through the magnetic body 14. Thus, a magnetic
flux path is formed in the magnetic body 14.
The magnetic body 14 is in the form of a tube
that has a ring-shaped cross section. A part of the
ring of the cross section is removed to form a gap. A
Hall element 11 is located in this gap. An amplifier 12
is connected to the Hall element 11. The output of the
amplifier 12 is connected to one end of a coil 13 that
is wound around the magnetic body 14 so as to surround
the magnetic flux path. The other end of the coil 13 is
grounded through a resistor 15. The Hall element 11,
amplifier 12, coil 13, magnetic body 14, and resistor
15 constitute a voltage output circuit 10 that detects
the actual current of the motor, converts it into
voltage, and outputs the voltage.
The value of voltage that is produced across the
resistor 15 is applied to the input of a first ΔΣ
modulator circuit 21. The output of the first ΔΣ
modulator circuit 21 is applied to the respective
inputs of first and second digital filters 22 and 23.
The output of the first digital filter 22
is applied to the input of an adder 27. The output of
the second digital filter 23 is applied to the input of
the current control circuit 3, and it is fed back to a
machine that is provided with the motor and the like or
a host control apparatus, such as a numerical control
apparatus.
On the other hand, a temperature sensor 16 is
located near the Hall element 11. In this embodiment,
the sensor 16 is attached to that part of the magnetic
body 14 which is situated near the Hall element 11. The
output of the temperature sensor 16 is applied to a
second ΔΣ modulator circuit 25 through an amplifier 24.
The output of the second ΔΣ modulator circuit 25 is
applied to the input of the adder 27 through a digital
filter 26. Further, the output of the adder 27 is fed
back to the current control circuit 3.
If the motor is actuated so that the motor
current flows through the electric conductor 4, a
magnetic flux is generated. This magnetic flux appears
intensively in the magnetic body 14. In FIG. 1, arrow A
represents the direction of the magnetic flux that is
generated as the current flows through the electric
conductor 4. This magnetic flux is detected by means of
the Hall element 11 in the gap that is formed by'
partially removing the tubular magnetic body 14. The
detection output of the Hall element 11 is amplified by
the amplifier 12, and current is supplied to the coil
13 so as to cancel the magnetic flux. More specifically,
the coil 13 is supplied with current such that a
magnetic flux that has a direction (arrow B) opposite
to the direction (arrow A) of the magnetic flux that is
produced by the current that flows through the electric
conductor 4 is formed in the magnetic body 14.
Thus, an infinitesimal current proportional to
the motor current that flows through the electric
conductor 4 flows through the resistor 15 that is
connected to the coil 13. A voltage difference across
the resistor 15 that is generated by the infinitesimal
current is applied to the input of the first ΔΣ
modulator circuit 21 and ΔΣ-modulated by the circuit
21. Thereupon, a one-bit digital signal that represents
the motor current value is outputted. The outputted
digital signal is cleared of quantizing noise and the
like by means of the first and second digital filters
22 and 23.
A one-bit digital signal output of the second
digital filter 23 is fed back to the current control
circuit 3 and the host control apparatus and utilized
for overcurrent detection. Thus, if the motor current
that is represented by the digital signal from the
second digital filter 23 is concluded to be an
overcurrent by an overcurrent detector circuit in the
current control circuit 3, the output (voltage command)
of the circuit 3 is stopped. The host control apparatus
gives an alarm or the like if the overcurrent is
identified by the level of the motor current that is
represented by the signal from the second digital
filter 23.
On the other hand, the output of the first
digital filter 22 is applied to the input of the adder
27. Further, the output of the temperature sensor 16 is
amplified by the amplifier 24, ΔΣ-modulated and
converted into a one-bit digital signal by the ΔΣ
modulator circuit 25, and applied to the input of the
adder 27 through the third digital filter 26.
The adder 27 adds the output (i.e., signal
indicative of temperature near the Hall element 11
detected by the temperature sensor 16) of the third
digital filter 26 to the output (i.e., signal
indicative of the motor current value based on the
magnetic flux detected by the Hall element 11) of the
first digital filter 22, thereby subjecting the offset
voltage of the Hall element 11 to temperature drift
compensation. After undergoing the temperature drift
compensation, the ΔΣ-modulated one-bit digital signal
that is indicative of the detected motor current value
is fed back to the current control circuit 3.
As mentioned before, the current control circuit
3 carries out current feedback control in accordance
with a feedback signal indicative of the detected motor
current value and the current commands from the host
circuit or the position and speed control circuit, and
delivers the voltage commands to the PWM signal
generator circuit 2. Based on these voltage commands,
the PWM signal generator circuit 2 generates and
outputs the PWM signal for turning on or off the
switching element of the inverter unit 1, thereby
drivingly controlling the inverter unit 1. Thus, the
driving current is supplied to each phase of the motor
to drive the motor.
The magnetic flux that is produced by the motor
current is detected by means of the Hall element 11.
The current that is caused to flow through the coil 13
and the resistor 15 by the detected magnetic flux is an
infinitesimal current that is proportional to and lower
than the motor current. Therefore, the resistor 15 may
be a small-capacity one that generates little heat. The
value of the voltage across the resistor 15 is
modulated and converted into a one-bit digital signal
by the ΔΣ modulator circuit 21, cleared of quantizing
noise and the like by means of the digital filters, and
fed back as an actual current detection feedback signal
to the current control circuit 3. Accordingly, an
accurate feedback signal that represents the actual
current can be obtained, so that the motor control
apparatus can be a small-sized, economical one. Further,
the digital signal that is modulated by means of the Δ
Σ modulator circuit 21 is an unweighted one-bit digital
signal. If the signal is subject to noise or the like
in the feedback path, therefore, it cannot be a
substantially wrong signal. Thus, an accurate current
detection signal that resists noise can be fed back.
According to the present invention arranged in
this manner, there may be provided a small-sized,
economical motor control apparatus that generates
little heat, owing to the small value of current
flowing through the resistor 15, which current is
proportional to the actual current of the motor flowing
through the electric conductor 4,
The value of the current flowing through the
resistor 15 is small compared with the motor current,
and is preferably infinitesimal which, in the context
of the present embodiment, is preferably a value below
1 ampere
To demonstrate how such a value may be arrived-at
in practice, an infinitesimal current may be given as a
value of electric current calculated by dividing the
motor current by the number of turns of coil 13 of Fig.
1.
Typically, the number of turns of a coil which is
widely used is about 2000, although the number of turns
may be selected dependent upon a motor current to be
detected. As a particular example, where the motor
current is 400 amperes and the number of turns of the
coil is 2000, the voltage output circuit 10 of Fig. 1
is preferably designed so that the infinitesimal
current flowing through the resistor 15 will be 0.2
ampere.
Claims (9)
- A motor control apparatus comprising:a voltage output circuit for detecting a magnetic flux from the current of a motor by means of a Hall element and outputting voltage proportional to the actual current of the motor in accordance with the detected magnetic flux; anda ΔΣ modulator circuit for detecting the voltage delivered from the voltage output circuit,the motor being subjected to feedback control based on the voltage detected by the ΔΣ modulator circuit.
- A motor control apparatus comprising:a circuit for detecting a magnetic flux from the current of a motor by means of a Hall element and for outputting a current proportional to, and smaller than, the actual current of the motor; anda ΔΣ modulator circuit for detecting the value of voltage produced across a resistor located in series at the output of the circuit,the motor being subjected to feedback control based on the voltage detected by the ΔΣ modulator circuit.
- The motor control apparatus according to claim 1 or 2, wherein the output of the ΔΣ modulator circuit is a one-bit digital signal to be processed by a digital filter.
- The motor control apparatus according to any one of claims 1 to 3, wherein the output value of the Δ Σ modulator circuit is used for overcurrent detection.
- The motor control apparatus according to any one of claims 1 to 4, wherein the temperature of a Hall element mounting region is detected by means of
temperature detecting means mounted near the Hall element, and the offset voltage of the Hall element is subjected to temperature drift compensation based on the temperature information. - The motor control apparatus according to claim 5, wherein the output of the temperature detecting means is modulated by means of a ΔΣ modulator circuit.
- The motor control apparatus according to claim 2, or any of claims 3 to 6 when appended to claim 2, wherein said current outputted by the circuit for detecting magnetic flux is a small current as compared with the actual motor current.
- The motor control apparatus according to claim 7, wherein said outputted current is an infinitesimal current.
- The motor control apparatus according to claim 7 or 8, wherein said outputted current is below 1 ampere
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002224369A JP3609069B2 (en) | 2002-08-01 | 2002-08-01 | Motor control device |
| JP2002224369 | 2002-08-01 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1387483A2 true EP1387483A2 (en) | 2004-02-04 |
| EP1387483A3 EP1387483A3 (en) | 2006-06-07 |
| EP1387483B1 EP1387483B1 (en) | 2009-11-04 |
Family
ID=30112979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03254732A Expired - Lifetime EP1387483B1 (en) | 2002-08-01 | 2003-07-29 | Motor control apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6919699B2 (en) |
| EP (1) | EP1387483B1 (en) |
| JP (1) | JP3609069B2 (en) |
| DE (1) | DE60329892D1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007017623A (en) * | 2005-07-06 | 2007-01-25 | Fujifilm Holdings Corp | Imaging device, light emission control device, and light emission device |
| KR101260243B1 (en) | 2011-08-19 | 2013-05-03 | 전자부품연구원 | Temperature compensation control method and apparatus of BLDC motor |
| JP5383855B2 (en) * | 2012-04-17 | 2014-01-08 | ファナック株式会社 | Motor control device having ΔΣ modulation type AD converter |
| JP5351304B2 (en) * | 2012-04-19 | 2013-11-27 | ファナック株式会社 | Motor control device having ΔΣ modulation type AD converter |
| DE102013209332A1 (en) * | 2013-05-21 | 2014-11-27 | Siemens Aktiengesellschaft | Electrical component with throttle and integrated current measuring device |
| JP6422278B2 (en) | 2014-09-19 | 2018-11-14 | ルネサスエレクトロニクス株式会社 | Power control circuit |
| GB2557272B (en) | 2016-12-02 | 2020-03-18 | Cmr Surgical Ltd | Sensing motor current |
| JP7173887B2 (en) * | 2019-02-01 | 2022-11-16 | ミネベアミツミ株式会社 | Semiconductor devices, motor drive control devices, and motor units |
| KR102736912B1 (en) * | 2019-12-26 | 2024-12-03 | 에스케이하이닉스 주식회사 | Digital filter and temperature sensor including the digital filter |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992015148A1 (en) * | 1991-02-22 | 1992-09-03 | U.S. Windpower, Inc. | Four quadrant motor controller |
| JPH05344780A (en) | 1992-06-10 | 1993-12-24 | Yokogawa Electric Corp | Dc brushless motor drive |
| US5345236A (en) * | 1992-12-21 | 1994-09-06 | Harris Corporation | Improved sigma-delta type analog-to-digital converter and method |
| US5319291A (en) * | 1993-02-17 | 1994-06-07 | Pitney Bowes Inc. | Brushless motor utilizing FET drivers |
| US5859510A (en) * | 1993-02-17 | 1999-01-12 | Pitney Bowes Inc. | Commutation board for brushless motor |
| JP3220570B2 (en) | 1993-06-25 | 2001-10-22 | オークマ株式会社 | Inverter control device |
| US5541488A (en) * | 1994-04-11 | 1996-07-30 | Sundstrand Corporation | Method and apparatus for controlling induction motors |
| US5811957A (en) * | 1995-12-21 | 1998-09-22 | General Motors Corporation | Speed sensorless hybrid vector controlled induction motor with zero speed operation |
| JP3327114B2 (en) * | 1996-04-24 | 2002-09-24 | ソニー株式会社 | Signal processing device, signal recording device, and signal reproducing device |
| JP3412434B2 (en) | 1996-12-24 | 2003-06-03 | 松下電器産業株式会社 | Digital servo controller |
| US6429639B1 (en) * | 1997-01-21 | 2002-08-06 | International Rectifier Corporation | Combined filter inductor and hall current sensor |
| US5901176A (en) * | 1997-04-29 | 1999-05-04 | Hewlett-Packard Company | Delta-sigma pulse width modulator control circuit |
| US5933453A (en) * | 1997-04-29 | 1999-08-03 | Hewlett-Packard Company | Delta-sigma pulse width modulator control circuit |
| US6232900B1 (en) * | 1998-02-10 | 2001-05-15 | Lucent Technologies, Inc. | Second order digital filter requiring only one sigma delta modulator |
| US6087969A (en) * | 1998-04-27 | 2000-07-11 | Motorola, Inc. | Sigma-delta modulator and method for digitizing a signal |
| JP2000134909A (en) | 1998-10-27 | 2000-05-12 | Fuji Electric Co Ltd | Current detector |
| AU751883B2 (en) * | 2000-01-18 | 2002-08-29 | Lg Electronics Inc. | Apparatus for detecting rotor position in brushless direct current motor |
| JP2001223126A (en) * | 2000-02-10 | 2001-08-17 | Matsushita Electric Ind Co Ltd | Current detector and motor control device using the same |
| US6437718B1 (en) * | 2000-06-28 | 2002-08-20 | Trw Inc. | Continuous time delta-sigma modulator |
| DE10032527C1 (en) * | 2000-07-05 | 2001-12-06 | Infineon Technologies Ag | Temperature compensation circuit for Hall element has two band separation reference circuits with resistances of two types, comparator comparing Hall voltage with reference potential |
| JP4451577B2 (en) * | 2001-07-26 | 2010-04-14 | パナソニック株式会社 | Magnetic field sensor |
| KR20040045905A (en) * | 2001-10-25 | 2004-06-02 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | Commutation of sensorless direct-current motors |
| US6788233B1 (en) * | 2003-08-15 | 2004-09-07 | Microchip Technology Incorporated | Digital decimation filter |
-
2002
- 2002-08-01 JP JP2002224369A patent/JP3609069B2/en not_active Expired - Fee Related
-
2003
- 2003-06-17 US US10/462,709 patent/US6919699B2/en not_active Expired - Lifetime
- 2003-07-29 EP EP03254732A patent/EP1387483B1/en not_active Expired - Lifetime
- 2003-07-29 DE DE60329892T patent/DE60329892D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1387483B1 (en) | 2009-11-04 |
| DE60329892D1 (en) | 2009-12-17 |
| JP3609069B2 (en) | 2005-01-12 |
| JP2004072807A (en) | 2004-03-04 |
| EP1387483A3 (en) | 2006-06-07 |
| US20040227485A1 (en) | 2004-11-18 |
| US6919699B2 (en) | 2005-07-19 |
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